CIA Director John Brennan pauses before speaking at the Council on Foreign Relations on March 13, 2015 in New York. (credit: DON EMMERT/AFP/Getty Images)

WASHINGTON (CBSDC) — A teenage “stoner” hacker claims he has infiltrated the personal email account of CIA Director John Brennan.

The high school student told The New York Post that he found several sensitive files on Brennan’s private AOL account – including his 47-page application for top-secret security clearance, Social Security numbers of more than a dozen top U.S. intelligence officials, and a government letter about the use of “harsh interrogation techniques” on terror suspects.

“I can’t believe he did this to the head of the CIA,” a source told The Post. “[The] problem with these older-generation guys is that they don’t know anything about cybersecurity, and as you can see, it can be problematic.”

The alleged hacker started a Twitter account under the handle @phphax, posting Brennan’s stolen emails to the account. He told The Post he is an “American high school student who is not Muslim and was motivated by opposition to U.S. foreign policy and support for Palestine.”

The hacker said he has repeatedly prank-called Brennan since August, even reciting the CIA director’s Social Security number to him.

“He waited a tiny bit and hung up,” the hacker said.

The hacker also claims he listened to Homeland Security Secretary Jeh Johnson’s voicemails after infiltrating his online Comcast account.

The FBI and Secret Service are investigating the alleged hackings.

“We are aware of the reports that have surfaced in social media and have referred the matter to appropriate authorities,” the CIA told CNN in a statement.